live unwrap missing form 3d viewport options
It seems like there are 2 Live Unwrap.
The first one is in the Options or in the N panel &gt; Tool &gt; Options, it will automatically refresh the UV map whenever you change the seams of the object:


The other one in the UV Editor. According to the docs, it &quot;continuously unwraps the selected UV islands while transforming pinned vertices&quot;: